// Given a version, figure out what the release notes are so that we can use this to pre-fill the
// relase notes on a GitHub release for the current version.

let path = require('path')
let fs = require('fs')
let { execSync } = require('child_process')

let tag = process.argv[2] || execSync(`git describe --tags --abbrev=0`).toString().trim()
let pkgPath = path.resolve(
  __dirname,
  '..',
  'packages',
  tag.slice(0, tag.indexOf('@', 1)).replace('/', '-')
)

let version = require(path.resolve(pkgPath, 'package.json')).version

let changelog = fs.readFileSync(path.resolve(pkgPath, 'CHANGELOG.md'), 'utf8')
let match = new RegExp(
  `## \\[${version}\\] - (.*)\\n\\n([\\s\\S]*?)\\n(?:(?:##\\s)|(?:\\[))`,
  'g'
).exec(changelog)

if (match) {
  let [, , notes] = match
  console.log(notes.trim())
} else {
  console.log(`Placeholder release notes for version: v${version}`)
}
